html, body, #app {
  height: 100%;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Arial', sans-serif;
  background: #f5f6fa;
}

main {
  min-height: 60vh;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px;
  box-sizing: border-box;
  width: 100%;
}

@media (max-width: 768px) {
  main {
    padding: 16px 4px;
    max-width: 100%;
  }
  header nav {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
}

header {
  width: 100%;
  margin: 0;
  padding: 0;
}
.el-menu {
  width: 100%;
  border-bottom: none;
  margin: 0;
  padding: 0;
}